Is there a word for the opposite condition of hypochondria, i.e. someone who denies being sick when they clearly are? I would just say that they are "in denial". Is there any other adequate word?

I thought about the obvious 'hyperchondria' but it doesn't seem to be used anywhere and doesn't look suitable as—from checking the origin of the word—just replacing 'hypo' by 'hyper' wouldn't fit well:

5 Answers
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Egosyntonic is a psychological term referring to behaviors, values, feelings that are in harmony with or acceptable to the needs and goals of the ego, or consistent with one's ideal self-image.

Many personality disorders are considered to be egosyntonic and are, therefore, difficult to treat. Anorexia nervosa, a difficult-to-treat Axis I disorder, is also considered egosyntonic because many of its sufferers deny that they have a problem.

This looks like the most suitable answer. Thanks!
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RenanDec 5 '12 at 15:01

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Needs and goals of ego are not always unreasonable and hence, sometimes there is nothing wrong in heeding to what it asks for. And that's why, this word doesn't seem to fit the required usage. Furthermore, OP asked very specifically for the opposite of the word "hypochondria" and I don't believe your answer comes close to the required medical aspect as well.
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MohitDec 5 '12 at 16:21

A widely used antonym for hypochondriac is "stoic." Spelt without a leading capital, it doesn't refer to the Stoic school of philosophy but to the general idea of ignoring or minimizing setbacks and unfavorable information.

You could perhaps make up a new word based on the term prosopagnosia, which refers to the neurogenic inability to recognize people's faces. The term would be pathagnosia, the inability to recognize sickness. However, this inability would in principle apply equally to others' illnesses, so that a sufferer of pathagnosia would be just as bad a doctor as a patient.